Testing if vitamin D lifts winter blues

Here in NC, we are nearly at the end of winter (thank goodness, relatively speaking, it's been a rough one!) but I was intrigued by this article from UPI.com. I had pretty severe seasonal affective disorder when I lived in Upstate NY, in fact, I had one of those special lights that you sit under each morning as "light therapy". For the record, I take 5000 IU's of Vitamin D3 daily, with my doctor's blessing. Have a great day (it's sunny here in NC today).